Cryptocurrency and Blockchain Dictionary

Terms commonly used in the world of blockchain and cryptocurrency

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2 Factor Authentication (2FA)

2 Factor Authentication is a double layer security measure. Most crypto exchanges use it. In order to log in, you not only need to enter a password, but also a code that you receive from the Google authenticator for example.

Other Important Terms

51% Attack

A ‘51% attack’ refers to a possible attack on a blockchain by a group of ‘miners’, who hold more than 50% of the hashrate. In such a situation the ‘miners’ have the possibility to deliberately not confirm transactions or to issue transactions twice (double-spend).

Ethereum

Launched in 2015, Ethereum is the world's programmable blockchain. Like other blockchains, Ethereum has a native cryptocurrency called Ether (ETH). ETH is digital money. People all over the world use ETH to make payments, as a store of value, or as collateral. But unlike other blockchains, Ethereum can do much more.

Altcoin

An altcoin is any cryptocurrency or token created after the Bitcoin was developed.

Bitcoin

Bitcoin is a digital or virtual cryptocurrency created in 2009 that uses peer-to-peer technology to facilitate instant payments.

Double Spending

With digital currency, there is a risk that the holder could make a copy of the digital token and send it to a merchant or another party while retaining the original.

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